2528223661 has 4 divisors (see below), whose sum is σ = 2528669632. Its totient is φ = 2527777692.

The previous prime is 2528223647. The next prime is 2528223679. The reversal of 2528223661 is 1663228252.

2528223661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2528223661 - 2¹¹ = 2528221613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2528223661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528223611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214371 + ... + 225856.

It is an arithmetic number, because the mean of its divisors is an integer number (632167408).

Almost surely, 2^2528223661 is an apocalyptic number.

It is an amenable number.

2528223661 is a deficient number, since it is larger than the sum of its proper divisors (445971).

2528223661 is an equidigital number, since it uses as much as digits as its factorization.

2528223661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445970.

The product of its digits is 69120, while the sum is 37.

The square root of 2528223661 is about 50281.4444999346. Note that the first 4 decimals coincide. The cubic root of 2528223661 is about 1362.2970948976.

The spelling of 2528223661 in words is "two billion, five hundred twenty-eight million, two hundred twenty-three thousand, six hundred sixty-one".